Abstract: A high capacity saw type cotton gin having the usual ginning ribs, hulling ribs, and saw cylinder, and structure defining a roll box generally above the intervening zone between the ginning and hulling ribs having an entrance at the top of the intervening zone to receive cotton carried through the hulling ribs, wherein a rotatable perforated seed removal tube is located at the interior portion of the seed roll formed in the roll box near its axis of rotation having many peforations sized to pass ginned seeds therethrough into its interior while preventing passage of unginned seeds. The seed removal tube is continuously rotated in a direction corresponding to the direction of seed roll rotation and at a surface speed significantly exceeding the speed imparted to the immediately confronting seed roll portions by the saws, and screw conveyor structure as provided within the tube rotated to convey the ginned seeds in the tube outwardly through end portions of the tube.

Abstract: An auxilliary seed discharge means comprising a helicoid conveyor running axially with and laterally through the length of, the roll box of a saw type cotton gin and extending outwardly thereof through circular openings in the roll box heads to seed discharge chutes. Suitable bearings are provided for rotatably journaling outside the roll box. An adequately rotatable tubular casing is provided to enclose the conveyor in some embodiments. The portion of the casing inside the roll box is suitably perforated to receive clean seed therein but the portions extending out to the seed chutes are plain. The tubular casing is separately rotatably journaled outside the roll box heads. For roughly harvested cotton containing excessive foreign matter, modified embodiments are provided in which the perforated casing is omitted and special helicoid conveyors having greater conveying capacity at the discharge end(s) than at the beginning are employed. Methods of construction for special conveyors is disclosed.